Calling all fish room experts! I am really going back and forth in putting an entire RO system for the new fish room or not. I am on city water, so I will have to get a carbon block at the very least to keep the chlorine out. But my water right now is super hard, liquid rock, which I absolutely love having since I enjoy a lot of livebearers. What would you advise? I have three options I believe. I should also say that I will be setting up an auto water change system as well.
Option #1: Put in a RO system for the whole fish room and use crushed coral or other things in the aquariums that I need a higher TDS
Option #2: Use the city water, put in a carbon block and filters to remove chlorine.
Option #3: Put in RO system but only have one rack on the system. Use the rest of the racks on the city water.